package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Slf4j
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private DishMapper dishMapper;

    /**
     * 新增套餐，同时需要保存 套餐和菜品 的关联关系
     * @param setmealDTO
     */
    @Transactional
    public void saveWithDish(SetmealDTO setmealDTO) {

        Setmeal setmeal = new Setmeal();

        BeanUtils.copyProperties(setmealDTO, setmeal);

        // 向套餐表插入数据
        setmealMapper.insert(setmeal);

        // 获取生成的套餐id
        Long setmealId = setmeal.getId();

        List<SetmealDish> setmealDishes=setmealDTO.getSetmealDishes();

        for(SetmealDish setmealDish:setmealDishes){
            setmealDish.setSetmealId(setmealId);
        }

        // 保存套餐表和菜品表的 关联关系
        setmealDishMapper.insertBatch(setmealDishes);

    }

    /**
     * 套餐分页查询
     * @param setmealPageQueryDTO
     * @return
     */
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        int page = setmealPageQueryDTO.getPage();
        int pageSize = setmealPageQueryDTO.getPageSize();
        PageHelper.startPage(page, pageSize);

        Page<SetmealVO> pageResult=setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(pageResult.getTotal(), pageResult.getResult());
    }

    /**
     * 根据id查询套餐和套餐菜品关系
     * @param id
     * @return
     */
    public SetmealVO getByIdWithDish(Long id) {
        Setmeal setmeal = setmealMapper.getById(id);
        List<SetmealDish> setmealDishes = setmealDishMapper.getBySetmealId(id);

        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal, setmealVO);
        setmealVO.setSetmealDishes(setmealDishes);

        return setmealVO;
    }

    /**
     * 修改套餐
     *
     * @param setmealDTO
     */
    @Transactional
    public void update(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);

        //1、修改套餐表，执行update
        setmealMapper.update(setmeal);

        //套餐id
        Long setmealId = setmealDTO.getId();

        //2、删除套餐和菜品的关联关系，操作setmeal_dish表，执行delete
        setmealDishMapper.deleteBySetmealId(setmealId);

        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealId);
        });
        //3、重新插入套餐和菜品的关联关系，操作setmeal_dish表，执行insert
        setmealDishMapper.insertBatch(setmealDishes);
    }

    /**
     * 批量删除套餐
     * - 可以一次删除一个套餐，也可以批量删除套餐
     * - 起售中的套餐不能删除
     * @param ids
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        ids.forEach(id->{
            Setmeal setmeal = setmealMapper.getById(id);
            if (StatusConstant.ENABLE==setmeal.getStatus()){
                //起售中的套餐不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        });

        ids.forEach(setmealId->{
            //删除套餐表中的数据
            setmealMapper.deleteById(setmealId);
            //删除套餐菜品关系表中的数据
            setmealDishMapper.deleteBySetmealId(setmealId);
        });

    }

    /**
     * 套餐起售停售
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id) {
        //1.起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
        // 如果是起售套餐（status == 1），需要判断套餐内是否有未启售的菜品
        if (StatusConstant.ENABLE == status){
            List<Dish> dishList=dishMapper.getBySetmealId(id);// // 获取套餐内的所有菜品
            log.info("待启售套餐 {} 的关联菜品列表: {}", id, dishList);
            if (dishList!=null&&dishList.size()>0){ // 如果套餐内有菜品
                dishList.forEach(dish->{ // 遍历每个菜品
                    log.info("菜品ID: {}, 状态: {}", dish.getId(), dish.getStatus());
                    // 如果套餐内有已启售的菜品，抛出异常，提示“套餐内包含未启售菜品，无法启售
                    if (StatusConstant.DISABLE==dish.getStatus()){
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }
        // 2.更新套餐状态（起售或停售）
        Setmeal setmeal = Setmeal.builder()
                .status(status)
                .id(id)
                .build();
        setmealMapper.update(setmeal);
    }

    /**
     * 条件查询套餐
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> setmealList= setmealMapper.list(setmeal);
        return setmealList;
    }

    /**
     * 根据套餐id查询包含的菜品
     * @param id
     * @return
     */
    public List<DishItemVO> getDishById(Long id) { //套餐id
         return setmealMapper.getDishItemBySetmealId(id);
    }
}
